http://blogs.msdn.com/katriend/archive/2009/07/10/silverlight-3-is-rtw-expression-blend-3-with-sketchflow-is-rc-go-get-them.aspxJust nine months after the release of Silverlight 2 in October 2008, the new version is here: Silverlight 3 has been released today! Next to Silverlight 3 you can also find the RC version of Expression Blend 3, including SketchFlow. This RC version targetsen-USCommunityServer 2.1 SP1 (Build: 61025.2)